Stamped concrete is one of the best-looking upgrades you can make to a patio, driveway or pool deck. But a lot of homeowners are surprised to learn that the rich color and finished look they paid for depend on something that wears off: the sealer. So does stamped concrete really need to be sealed, and how often?
The short answer is yes, and in Colorado we generally recommend resealing every 2 to 3 years. Here is why, how to tell when it is time, and what your options are when your stamped concrete starts looking tired.
Why Stamped Concrete Needs Sealer
Stamped concrete gets its look from color and texture. The base color is mixed into or broadcast onto the concrete, and a second accent color highlights the texture and joints of the stamp pattern. A sealer goes on top to lock it all in. That sealer does several jobs at once:
- Brings out the color. Sealer deepens the color and gives stamped concrete its finished, "wet" look. Without it, the same concrete looks chalky and flat.
- Protects against water and freeze-thaw. Colorado concrete goes through dozens of freeze-thaw cycles every winter. Sealer helps keep water out of the surface, where it freezes and causes flaking.
- Guards against de-icing salts. Magnesium chloride from the roads and salt from sidewalks are hard on concrete. We explain why in magnesium chloride and your concrete driveway.
- Blocks UV fading. The sun at our altitude is intense, and unprotected color fades faster here than in most places.
- Resists stains. Oil, leaves, grease from the grill and spilled drinks sit on top of sealed concrete instead of soaking in.
Unsealed stamped concrete does not fall apart overnight, but it fades, stains and weathers much faster, and the decorative finish you paid extra for disappears.
How Often Should Stamped Concrete Be Sealed?
For stamped concrete in the Denver metro, we generally recommend resealing every 2 to 3 years. Some surfaces need it sooner:
- Driveways, which take tire traffic and tracked-in mag chloride
- South and west-facing patios that bake in the afternoon sun
- Pool decks, which see constant water and chemicals
- Areas where snow is shoveled or salt is used often
A covered patio that sees light foot traffic may hold up toward the longer end of that range.
Signs Your Stamped Concrete Needs to Be Resealed
- The color looks faded or washed out, especially in high-traffic paths.
- The surface looks dry, dull or chalky instead of rich and glossy.
- Water soaks in instead of beading up. Splash some water on it. If it darkens the concrete right away, the sealer is worn out.
- White, cloudy or peeling patches show the old sealer is failing.
- Stains are soaking in that used to wipe right off.
Reseal or Rejuvenate?
Once your stamped concrete needs attention, there are two main options, and the right one depends on how much color is left.
Power wash and reseal
If the color is still in good shape and the surface just looks dull, a power wash and reseal is usually all it needs. We clean off the dirt and grime, then apply a fresh coat of solvent-based acrylic sealer to bring back the finished look and protect it. We use solvent-based sealer on all of our decorative sealing because it brings out the color best and holds up well outdoors. See water-based vs. solvent-based acrylic sealers for the full comparison. This typically runs $1.50 to $2.00 per square foot.
Stamped concrete rejuvenation
If the color has faded and the stamp pattern has lost its depth, a reseal alone will not bring it back. Our rejuvenation service power washes the concrete, uses a xylene treatment to open up the old sealer, adds a new accent color (Brickform Antique-It) to bring back the highlights in the pattern, and then seals it. That adds color back into the concrete instead of just putting a coat on top. Rejuvenation typically runs $2.00 to $3.00 per square foot.
All sealing jobs have a $700 minimum. Where a project falls in the price range depends on the stamp pattern. The more lines and grooves in the pattern, the more time it takes to clean, color and seal every joint.
What about tinted sealer?
Adding a color tint to the sealer can freshen up concrete that has faded slightly, and it is a less involved option. Keep in mind it is a 2 to 3 year solution, because the color lives in the sealer and wears off with it.
Is Sealed Stamped Concrete Slippery?
A glossy sealer can be slick when it is wet or icy, which matters on pool decks, steps and sloped driveways. The fix is an anti-slip additive mixed into the sealer. It adds grip without taking away the protection or most of the look. If your stamped concrete is around a pool or on a slope, ask about it when you reseal.
When Is the Best Time to Seal Stamped Concrete in Denver?
Sealer needs mild, dry weather to go down properly and cure. In the Denver area, we do most sealing from spring through fall. Late summer and early fall are popular because the concrete gets fresh protection right before the first snow and the season's first round of mag chloride. If you want your patio looking its best for summer, booking a spring reseal is a good plan.
Can I Seal Stamped Concrete Myself?
You can, but stamped concrete is less forgiving than a plain slab. Common problems include sealer that turns white or cloudy, puddles of sealer in the joints and low spots, roller marks, and a slippery finish. The deep grooves in a stamp pattern also take a lot of time to clean and coat evenly, which is why detailed patterns cost more to seal. If your concrete has old sealer that is already peeling or cloudy, it needs to be dealt with before a new coat goes on.
If you would rather have it done right the first time, our concrete sealing and rejuvenation service handles everything from a simple reseal to a full color restoration.